Following this fix, i got it to function, but since then, I keep getting random sound cracks/drops - it sounds like my output gets set to 50% randomly and then readjusts.
Read this was a driver issue/conflict:
-tried Unified drivers from Maxedtech, didn't help, and most recent version included Hata Region Unload Virus- cleared and reinstalled from Asus site
-read that this was associated w/ Nvidia driver conflict creating higher DPC latency, removed Nvidia HD Audio and this helped some, lowered the frequency of drops, but I still get issues after ~30 min.
-also read it could be an issue w/ the Nvidia power saver, adjusted settings for full performance and saw no improvement.

I know this is an old card, and it seems this issue dates back at least 4-5 years in various forms, but I'm hoping someone else may have figured it out by now. I've posted my most recent DPC report from LatencyMon below. I'm not really sure how to interpret/what to do next - any help is appreciated!

Cheers,

CONCLUSION
____________________________________________________________________________________________________ _____
Your system seems to be having difficulty handling real-time audio and other tasks. You may experience drop outs, clicks or pops due to buffer underruns. One or more DPC routines that belong to a driver running in your system appear to be executing for too long. One problem may be related to power management, disable CPU throttling settings in Control Panel and BIOS setup. Check for BIOS updates.
LatencyMon has been analyzing your system for 0:39:34 (h:mm:ss) on all processors.

Note: reported execution times may be calculated based on a fixed reported CPU speed. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results.

WARNING: the CPU speed that was measured is only a fraction of the CPU speed reported. Your CPUs may be throttled back due to variable speed settings and thermal issues. It is suggested that you run a utility which reports your actual CPU frequency and temperature.

____________________________________________________________________________________________________ _____
MEASURED INTERRUPT TO USER PROCESS LATENCIES
____________________________________________________________________________________________________ _____
The interrupt to process latency reflects the measured interval that a usermode process needed to respond to a hardware request from the moment the interrupt service routine started execution. This includes the scheduling and execution of a DPC routine, the signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.

____________________________________________________________________________________________________ _____
REPORTED ISRs
____________________________________________________________________________________________________ _____
Interrupt service routines are routines installed by the OS and device drivers that execute in response to a hardware interrupt signal.

____________________________________________________________________________________________________ _____
REPORTED DPCs
____________________________________________________________________________________________________ _____
DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.

____________________________________________________________________________________________________ _____
REPORTED HARD PAGEFAULTS
____________________________________________________________________________________________________ _____
Hard pagefaults are events that get triggered by making use of virtual memory that is not resident in RAM but backed by a memory mapped file on disk. The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted and blocked from execution.

I had similar problems (cracks, latency) when I bought Xonar D2X; spent some searching at hardware forums and found recommendation: "Disable CPU C State Capability in BIOS". After this change, no Xonar-related problems at all. The souncard works flawlessly for nine years, currently in Windows 10 using Win7 drivers.

You can try if this resolves your problem. See page 2-28 of your mobo manual.

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I changed power plan settings but haven't messed w/ bios just yet. The drops do seem to coincide w/ idle times where power saving would be kicking in. I noticed this specifically with my mouse and have disabled power saving through device manager. Seems to have stopped bouncing for the moment, but this will be my next stop.

Thanks again!

Cheers,

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